
Operation description for HMI 7-inch touch screen
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5.11 Interface definition
The liquid-crystal display touch screen has a power interface, and the power supply adopts DC12V. The “+” shall be
connected to the DC power supply 12V, and the “-” shall be connected to the earthed power supply. A RS485
communication interface is connected with unit’s control board for communication, A1 is connected with A of unit control
board 485 interface, and B1 is connected with B of unit control board 485 interface, as shown in the following figure:
HMI wiring terminal
RS485
interface
Power supply
interface
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